12_3/4x20_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Hydroponics the resolution is in increments

the resolution is in increments of 10 ppm

Please Note a Lead Time of 4 to 6 weeks

8 AM Arizona Time for shipment Tuesday

or as a stand alone dechlorinating and sediment filter

or grow fresh herbs right in your kitchen

12_3/4x20_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Hydroponics the resolution is in incrementsNordic Pure Custom MERV 8 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition